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Full Discussion: Perl: restrict perl from automaticaly creating a hash branches on check
Top Forums Programming Perl: restrict perl from automaticaly creating a hash branches on check Post 302924341 by durden_tyler on Saturday 8th of November 2014 02:12:18 AM
Old 11-08-2014
That's a documented behavior in Perl and is called "autovivification".
Check the stackoverflow website for the question "How do I disable autovivification in Perl?" for a detailed discussion and workarounds.

gandolf989 has a point here. Any reason you do *not* want the intermediate branches to be created? As long as they are empty and your existence checks return the values as expected, your program should be fine.

Autovivification in Perl is by design. It's not a bug; it's a feature. And I think it stems from Perl's tendency to go out of its way to make your text processing task easy.
For an in-depth technical discussion of why it works like that, what its advantages are and what problems it solves, check this link: http://www.sysarch.com/Perl/autoviv.txt
This User Gave Thanks to durden_tyler For This Post:
jim mcnamara
 

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LEARN ABOUT SUSE

finance::quote::cdnfundlibrary

Finance::Quote::Cdnfundlibrary(3)			User Contributed Perl Documentation			 Finance::Quote::Cdnfundlibrary(3)

NAME

       Finance::Quote::Cdnfundlibrary  - Obtain mutual fund prices from www.fundlibrary.com

SYNOPSIS

	   use Finance::Quote;

	   $q = Finance::Quote->new;

	   %stockinfo = $q->fetch("canadamutual","fundlib-code"); # Can
       failover to other methods
	   %stockinfo = $q->fetch("fundlibrary","fundlib-code"); # Use this
       module only.

	   # NOTE: currently no failover methods exist for canadamutual

DESCRIPTION

       This module obtains information about Canadian Mutual Fund prices from www.fundlibrary.com.  The information source "canadamutual" can be
       used if the source of prices is irrelevant, and "fundlibrary" if you specifically want to use www.fundlibrary.com.

FUNDLIB-CODE
       In Canada a mutual fund does not have a unique global symbol identifier.

       This module uses an id that represents the mutual fund on an id used by www.fundlibrary.com.  There is no easy way of fetching the id
       except to jump onto the fundlibrary website, look up the fund and view the url for clues to its id number.

LABELS RETURNED

       Information available from fundlibrary may include the following labels:

       exchange method link source name currency yield last nav price.	The link label will be a url location for a one page snapshot that
       fundlibrary provides on the fund.

SEE ALSO

       Fundlibrary website - http://www.fundlibrary.com/

       Finance::Quote

perl v5.12.1							    2009-10-05					 Finance::Quote::Cdnfundlibrary(3)
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